I'm trying to determine if the dealer did anything tricky or if just perhaps didn't treat it well during the couple of years they had it on the lot with little usage. From what I read in other threads, this car is close to losing the first bar.
I don't see anything that would make me think the dealer was underhanded, and certainly nothing that would put the car in the lemon class.
Now, how much battery capacity do you have ? Something under 20 kWh.
What range is that good for ? Figure 2 kWh are not usable in one fashion or another, so 18 kWh from "charged to full" until "worrying about the car stopping."
With snow tyres and cabin heater use you are probably getting ~ 3.5 miles a kWh*, so range will be 18*3.5 = 63 miles
In better weather, less energy use tyres and less power drain from carbin heating, with non-aggressive driving it is pretty easy to manage 5 miles per kWh and then range will increase to ~ 18 * 5 = 90 miles.
*You can reset the trip meter and see your miles per kWh consumption from that point on. My car has one trip meter; some LEAFs have two I think.
Try to keep in mind that range is determined by battery capacity * consumption rate. Your present range is depressed by a battery that is in not great but not horrible condition, and a high consumption rate. In better weather the consumption rate (miles per kWh) will likely improve a lot and the range along with it.
There is a nice silver lining to your battery I think: either the Ahr rating will improve as the car comes out of its multi-year slumber at the dealer and then you will continue with the best Nissan has been able to make thus far, or you will probably end up with a warrantied free battery replacement in a couple of years by losing 4 bars of capacity within 5 yrs/60k miles. Time will tell. I suggest you track LeafSpy every quarter or so and enjoy the car along the way. The 5 year clock starts from when the car was put in service (first titled) and is noted on a vehicle history report. Google for a free one.